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Cards marked with numbers 5, 6, 7, ........

Cards marked with numbers 5, 6, 7, ......., 30 are placed in a box and mixed thoroughly and one card is drawn at random from the box. What is the probability that the number on the card is (i) a prime number ? (ii) a multiple of 3 or 5 ? (iii) neither divisible by 5 nor by 10?

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